CN110803105A - Control method and device for automobile lamp and automobile - Google Patents
Control method and device for automobile lamp and automobile Download PDFInfo
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- CN110803105A CN110803105A CN201911119771.1A CN201911119771A CN110803105A CN 110803105 A CN110803105 A CN 110803105A CN 201911119771 A CN201911119771 A CN 201911119771A CN 110803105 A CN110803105 A CN 110803105A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
- B60Q11/005—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/40—Cooling of lighting devices
- F21S45/42—Forced cooling
- F21S45/43—Forced cooling using gas
Abstract
The invention discloses a control method and a control device of an automobile lamp and an automobile, wherein the method comprises the following steps: acquiring a plurality of temperature signals of each LED unit through a plurality of temperature sensors; acquiring the current temperature of the central area of each LED unit according to the plurality of temperature signals; and determining the highest value of the current temperature of the central area, and determining the target rotating speed of the cooling fan according to the highest value of the current temperature and the current temperature change rate when the highest value is greater than or equal to the first temperature value and less than or equal to the second temperature value. According to the control method, the accuracy of the temperature detection of the car lamp can be improved, so that the control mode of the fan is optimized, the temperature detection requirement of the car lamp is effectively met, energy is saved, the control timeliness is improved, and the control method is safer and more reliable.
Description
Technical Field
The invention relates to the technical field of vehicle illumination, in particular to a control method and device of an automobile lamp and an automobile.
Background
Currently, some automotive lights contain multiple LED units, each of which can be individually controlled. In the related art, the temperature of the automobile lamp is detected by a single or a few temperature sensors, which is obviously insufficient to clearly determine the accurate temperature of each LED unit, so that the accurate control of each LED unit is insufficient, especially for an intelligent LED lamp, the advantages of the intelligent LED lamp cannot be effectively exerted, even the temperature of the individual LED unit is not detected due to the overhigh internal temperature, so that the failure of the lamp due to the failure of the temperature control is caused, or the temperature sensor cannot be arranged at the central position of the LED unit due to the spatial interference, the temperature of the central position of each LED unit cannot be accurately measured, the temperature can be roughly controlled only by amplifying the safety margin, and the requirements of the temperature detection and the accurate control of the lamp cannot be met.
In addition, the light emitting chip of the LED unit has a small volume and high heat, and needs to accurately control the current, so that the inside of the LED car lamp needs to be equipped with a corresponding power module to control the current, and further increases the heat productivity of the car lamp, so that the LED headlight needs to be equipped with a radiator and a heat dissipation fan to ensure that the temperature of the internal circuit of the car lamp is within a controllable range. In the related art, the threshold-based step control is adopted, and a plurality of thresholds are set, so that when the temperature reaches a certain temperature range, the cooling fan is controlled to work at a certain specific rotating speed, but the control mode is not optimized enough, the rotating speed of the fan changes step by step, and in addition, because the temperature of the LED unit cannot be measured accurately, the safety margin needs to be amplified, the energy conservation is not facilitated, meanwhile, the change trend and the speed of the temperature are not considered, the lag in temperature control exists, and the response is not timely enough.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a method for controlling an automotive lamp, which can effectively meet the requirement of detecting the temperature of the lamp, save energy, improve the timeliness of control, and be safer and more reliable.
Another object of the present invention is to provide a control device for a vehicle lamp.
It is a further object of the present invention to provide an automotive lamp.
In order to achieve the above object, an embodiment of the present invention provides a control method for an automotive lamp, where each LED unit of the lamp is correspondingly provided with a plurality of temperature sensors, where the method includes: acquiring a plurality of temperature signals of each LED unit through the plurality of temperature sensors; acquiring the current temperature of the central area of each LED unit according to the plurality of temperature signals; determining the highest value of the current temperature of the central area, and determining the target rotating speed of the cooling fan according to the highest value of the current temperature and the current temperature change rate when the highest value is greater than or equal to a first temperature value and is less than or equal to a second temperature value, wherein the second temperature value is greater than the first temperature value.
According to the control method of the automobile lamp, each LED unit is correspondingly provided with the plurality of temperature sensors, so that the current temperature of the central area is obtained according to the plurality of temperature signals, the target rotating speed of the cooling fan is determined according to the highest value of the current temperature, the accuracy of the temperature detection of the automobile lamp is improved, the control mode of the fan is optimized, the temperature detection requirement of the automobile lamp is effectively met, energy is saved, the timeliness of the control is improved, the control method is safer and more reliable, and the use experience is improved.
In addition, the control method of the vehicle lamp according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the method of an embodiment of the present invention further includes: and if the highest value of the current temperature is smaller than the first temperature value, stopping the operation of the cooling fan.
Further, in an embodiment of the present invention, the method of an embodiment of the present invention further includes: and if the highest value of the current temperature is greater than the second temperature value and less than or equal to the first temperature protection value, controlling the cooling fan to operate at the highest rotating speed, wherein the first temperature protection value is greater than the second temperature value.
Further, in an embodiment of the present invention, the method of an embodiment of the present invention further includes: if the highest value of the current temperature is greater than the first temperature protection value and is less than or equal to a second temperature protection value, controlling the cooling fan to operate at the highest rotating speed, and adjusting the working power of the LED unit with the temperature greater than the first temperature protection value by a power limitation strategy, wherein the second temperature protection value is greater than the first temperature protection value; and if the highest value of the current temperature is greater than the second temperature protection value, controlling the cooling fan to operate at the highest rotating speed, and simultaneously stopping the LED units with the temperature greater than the second temperature protection value from working.
Further, in an embodiment of the present invention, the method of an embodiment of the present invention further includes: detecting the current rotating speed and/or current of the cooling fan; and sending alarm information when the fault of the cooling fan is confirmed according to the current rotating speed and/or the current.
In order to achieve the above object, according to another aspect of the present invention, a control device for an automotive lamp is provided, each LED unit of the lamp is provided with a plurality of temperature sensors, wherein the device includes: the acquisition module is used for acquiring a plurality of temperature signals of each LED unit through the plurality of temperature sensors; the acquisition module is used for acquiring the current temperature of the central area of each LED unit according to the plurality of temperature signals; the first control module is used for determining the highest value of the current temperature of the central area, and determining the target rotating speed of the cooling fan according to the highest value of the current temperature and the current temperature change rate when the highest value is larger than or equal to a first temperature value and smaller than or equal to a second temperature value, wherein the second temperature value is larger than the first temperature value.
According to the control device of the automobile lamp, each LED unit is correspondingly provided with the plurality of temperature sensors, so that the current temperature of the central area is obtained according to the plurality of temperature signals, the target rotating speed of the cooling fan is determined according to the highest value of the current temperature, the accuracy of the temperature detection of the automobile lamp is improved, the control mode of the fan is optimized, the temperature detection requirement of the automobile lamp is effectively met, energy is saved, the control timeliness is improved, the control device is safer and more reliable, and the use experience is improved.
In addition, the control device of the vehicle lamp according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the apparatus of the embodiment of the present invention further includes: and the second control module is used for stopping the operation of the cooling fan when the highest value of the current temperature is smaller than the first temperature value.
Further, in an embodiment of the present invention, the apparatus of the embodiment of the present invention further includes:
the third control module is used for controlling the cooling fan to operate at the highest rotating speed when the highest value of the current temperature is greater than the second temperature value and is less than or equal to the first temperature protection value, wherein the first temperature protection value is greater than the second temperature value;
the fourth control module is used for controlling the cooling fan to operate at the highest rotating speed and adjusting the working power of the LED unit with the temperature greater than the first temperature protection value by a power limiting strategy when the highest value of the current temperature is greater than the first temperature protection value and is less than or equal to a second temperature protection value, wherein the second temperature protection value is greater than the first temperature protection value;
and the fifth control module is used for controlling the heat radiation fan to operate at the highest rotating speed and stopping the LED units with the temperature higher than the second temperature protection value from working when the highest value of the current temperature is higher than the second temperature protection value.
Further, in an embodiment of the present invention, the apparatus of the embodiment of the present invention further includes: the detection module is used for detecting the current rotating speed and/or current of the cooling fan; and the sending module is used for sending alarm information when the fault of the cooling fan is confirmed according to the current rotating speed and/or the current.
In order to achieve the above object, according to another aspect of the present invention, an automobile is provided, which includes: the vehicle lamp comprises a plurality of LED units, wherein each LED unit is correspondingly provided with a plurality of temperature sensors; and the control device of the automobile lamp. This car can obtain the regional current temperature in center of LED unit according to a plurality of temperature signals to confirm radiator fan's target rotational speed according to the maximum value of current temperature, improve the accuracy that car light temperature detected, thereby optimize the control mode of fan, not only effectively satisfy the temperature detection demand of car light, the energy saving improves the ageing of control moreover, and safe and reliable more promotes and uses experience.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method of controlling vehicle lights according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an automotive lamp according to one embodiment of the present invention;
fig. 3 is a block diagram schematically illustrating a control device for vehicle lamps according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a control method and device for an automobile lamp and an automobile according to an embodiment of the present invention with reference to the drawings, and first, a control method for an automobile lamp according to an embodiment of the present invention will be described with reference to the drawings.
Fig. 1 is a flowchart of a control method of an automobile lamp according to an embodiment of the present invention.
As shown in fig. 1, the control method of the vehicle lamp comprises the following steps:
in step S101, a plurality of temperature signals of each LED unit are collected by a plurality of temperature sensors.
In the embodiment of the invention, each LED unit of the vehicle lamp is correspondingly provided with a plurality of temperature sensors. Specifically, a temperature sensor array may be provided on the automobile, by arranging a plurality of (for example, 4 in the horizontal and vertical directions as shown in fig. 2) sensors around the LED unit (one sensor may not be placed in the middle of the LED unit) and thereby obtaining an accurate temperature of the characteristic position.
In step S102, the current temperature of the central region of each LED unit is acquired from the plurality of temperature signals.
For example, after obtaining a plurality of sensor signals, the temperature of the center of the LED unit is obtained indirectly by calculation (for example, linear interpolation and taking a larger value) instead of rough measurement and control by adding one or more temperature sensors to the lamp assembly, and the temperature change rate can also be calculated based on the temperature and time as one of the input quantities of the control strategy, which will be described in the following by way of example.
In step S103, a maximum value of the current temperature of the central region is determined, and when the maximum value is greater than or equal to a first temperature value and less than or equal to a second temperature value, a target rotation speed of the cooling fan is determined according to the maximum value of the current temperature and a current temperature change rate, where the second temperature value is greater than the first temperature value.
It should be noted that, when the temperature is greater than or equal to the first temperature value (e.g. 40 °) and less than or equal to the second temperature value (e.g. 60 °), the second temperature represents a rated temperature, the fan below the rated temperature can be operated at a regulated (lower than rated) rotational speed, the target rotational speed for the rotational speed regulation can be obtained according to the actual temperature and the temperature change rate, and the fan is operated at the highest rotational speed above the rated temperature.
Specifically, a plurality of LED unit arrays are arranged in the LED car lamp according to a specific rule, a plurality of distributed temperature sensor arrays can be adopted to acquire temperature, each sensor is selectively switched through a multi-path analog selector to acquire signals, interpolation calculation is carried out based on the space positions of the LED units and the temperature sensors and the temperature acquired by each temperature sensor, the temperature value of any position can be theoretically estimated, particularly the temperature value of the central part (an LED chip) of each LED unit, namely the temperature of the part with the highest temperature of each LED unit, and therefore the corresponding LED unit is controlled according to the temperature value of the central part, relatively accurate control is achieved, and the temperature is controlled by adjusting the rotating speed of a cooling fan and adjusting the output power of each LED unit. In particular, the control of the cooling fan speed is based on the temperature value of the LED unit and the rate of change of the temperature, taking into account that both the ambient temperature and the power demand of the LED vehicle lamp are changing. That is, the higher the temperature increase rate, the higher the fan rotation speed.
Further, in an embodiment of the present invention, the method of an embodiment of the present invention further includes: and if the highest value of the current temperature is less than the first temperature value, stopping the operation of the cooling fan.
It will be appreciated that, taking the linear calculation as an example, the lowest temperature (e.g. 40 °): the fan may be stopped at or below this temperature.
Further, in an embodiment of the present invention, the method of an embodiment of the present invention further includes: and if the highest value of the current temperature is greater than the second temperature value and less than or equal to the first temperature protection value, controlling the cooling fan to operate at the highest rotating speed, wherein the first temperature protection value is greater than the second temperature value.
Further, in an embodiment of the present invention, the method of an embodiment of the present invention further includes: if the highest value of the current temperature is greater than the first temperature protection value and is less than or equal to the second temperature protection value, controlling the cooling fan to operate at the highest rotating speed, and adjusting the working power of the LED unit with the temperature greater than the first temperature protection value by a power limiting strategy, wherein the second temperature protection value is greater than the first temperature protection value; and if the highest value of the current temperature is greater than the second temperature protection value, controlling the cooling fan to operate at the highest rotating speed, and simultaneously stopping the LED units with the temperature greater than the second temperature protection value from working.
It will be appreciated that, taking a linear calculation as an example, between above a first protection temperature (e.g., 85 °) and below a second protection temperature (e.g., 100 °), embodiments of the present invention may perform power limiting, with the limiting power factor being calculated based on temperature. It should be noted that once the temperature is higher than the second temperature (e.g. 60 °), the cooling fan needs to keep operating at the highest rotation speed, but once the temperature is higher than the second protection temperature (e.g. 100 °), the embodiment of the present invention turns off the related LED unit to avoid safety accidents.
Further, in an embodiment of the present invention, the method of an embodiment of the present invention further includes: detecting the current rotating speed and/or current of the cooling fan; and when the fault of the cooling fan is confirmed according to the current rotating speed and/or the current, alarm information is sent.
It can be understood that, in the embodiment of the present invention, the current and/or the rotation speed of the fan may be detected, so that whether the working state of the fan is normal or not may be known by comparing the control amount with the data fed back by the fan with the data obtained by the preliminary test.
For example, the car lamp may be composed of an LED unit and a corresponding temperature sensor array, an analog channel selector, a heat dissipation fan, a fan speed detection and/or fan current detection interface, and a single chip microcomputer. The temperature detection device comprises a singlechip, a plurality of temperature sensors, a plurality of analog switches and a plurality of temperature sensors, wherein the temperature sensors are arranged near each LED unit for temperature detection, the singlechip switches and selects channels of the temperature sensors through the analog switches, the temperature is measured one by one, and interpolation calculation is carried out according to the combination of signals of the sensors near each LED unit and the spatial arrangement relation to obtain the temperature of the center of the LED unit.
Firstly, when the system is powered on, the fan is controlled to rise from the lowest rotating speed to the highest rotating speed, the rotating speed and/or the working current of the fan are/is sampled at the same time, and fault diagnosis is carried out on the fan. Secondly, when the highest temperature of the LED unit is lower than 40 degrees, the heat radiation fan stops working; when the maximum temperature of the LED unit is between 40 degrees and 60 degrees, the cooling fan works according to a conventional control flow, and for example, the rotating speed of the cooling fan is linearly controlled according to the maximum temperature and the temperature change rate; when the maximum temperature of the LED unit exceeds 60 degrees, the heat dissipation fan runs at the maximum rotating speed; when the temperature of the LED units exceeds 85 degrees, the corresponding LED units operate in a limited power mode; and when the temperature of the LED units exceeds 100 degrees, the corresponding LED units stop working.
It should be noted that, the conventional control flow may be, but is not limited to, obtaining a value of the target fan speed based on the maximum LED unit temperature and the temperature change rate, and performing corresponding control. The limited power operation can obtain a corresponding limited power coefficient through calculation of the actual temperature, the first protection temperature and the second protection temperature, and the product of the limited power coefficient and the conventional output power is used as the actual output power.
In addition, the protection temperature or the temperature value may be set by a person skilled in the art according to practical circumstances, and is not particularly limited herein.
In the embodiment of the invention, the temperature of the central position of each LED unit can be accurately calculated by estimating the temperature based on not less than 2 spatial direction dimensions, so that the control accurate to a single LED unit can be implemented, such as the limited power output or the stop of work of a specific LED unit, and the change trend of the temperature and the temperature is comprehensively considered, and the fan is accurately controlled based on the temperature, so that the control of the fan is more intelligent, the response is faster, the heat dissipation effect is better, the energy is more saved, particularly, the limited power coefficient is calculated in the limited power stage, the continuous adjustment of the power in a certain interval is realized, and the temperature control is also good.
The working principle of the embodiment of the present invention is described in detail below with reference to a specific embodiment.
As shown in FIG. 2, in the example of the linear arrangement of the LED units, 1, 2 and 3 are the numbers of the LED units, A, B … … J are the numbers of the temperature sensors, respectively, and the center temperature of the LED unit "3" is represented by T3The temperature output by the temperature sensor C, D, E, F is T in turnC、TD、TE、TF，L1、L2、L3、L4The distance between the corresponding temperature sensor and the center of the LED unit 3 is horizontal or vertical, the LEDs and the temperature sensors can be uniformly distributed in space under general conditions, and the method can be used for calculating the center temperature of the LEDs in consideration of factors such as space limitation of hardware design. Let T3-1＝TC+(TD-TC)*L1/(L1+L2)，T3-2＝TF+(TE-TF)*L4/(L3+L4) The above formula respectively carries out linear interpolation calculation in the horizontal direction and the vertical direction, T3Taking the above T3-1、T3-1The larger value of the temperature difference is equal to the larger value of the temperature difference, and any temperature may be selected. According to the method, the temperature sensors can be arranged along with the spatial arrangement of the LED units, and the accurate temperature of all the LED units can be estimated. The temperature sensors are more in number, sensor signals are selected through a plurality of analog channel selectors, signals are collected in sequence, and for example, a multi-channel analog switch chip can be adopted to achieve the function of channel switching selection.
Further, the single chip microcomputer acquires the temperature of each sensor according to a set time interval and calculates the change rate of the temperature, it should be noted that, considering that the temperature changes relatively slowly and has hysteresis, the time interval for acquiring the temperature and the time interval for calculating the change rate of the temperature may be different, and one possible embodiment of the present invention may be: all the sensor temperatures are collected once every 1 second, the change rate of the temperature is calculated once every 30 seconds, and it should be noted that the time interval may be a fixed value or may be specified by a control strategyThe values of the changes, such as shorter time intervals when the temperature changes faster and longer time intervals when the temperature changes slower. Based on the temperature and the temperature change rate, the rotating speed of the cooling fan is controlled, and meanwhile, the automobile LED headlamp assembly is defined as follows: first rotation speed S0-corresponding to the lowest operating speed of the fan; second rotational speed S1-corresponding to the nominal fan speed; third rotational speed S3-corresponding to the maximum operating speed of the fan. First temperature T1The headlamp can continuously work at the temperature corresponding to the temperature obtained by the experiment through natural convection; second temperature T2The rated operating temperature of the LED unit at which the LED unit can continue to operate at full load without damage; first protective temperature TP1The temperature is higher, and the LED unit is required to work in a power limiting mode; second protective temperature TP2In response to the limit temperature, the operation of the LED unit needs to be stopped to prevent the LED unit from being damaged. The physical quantities related to classification, such as the first rotation speed, the second rotation speed, the third rotation speed, the first temperature, the first protection temperature, and the like, are set by considering the concept of threshold values in the control process, so as to eliminate the interference of errors and avoid the frequent switching of the control action near the zero limit point. Taking the temperature as an example, if the threshold is set to 1 degree celsius, when the temperature rises from the first temperature, the temperature is determined to reach the second temperature when the temperature exceeds the second temperature by one threshold, and similarly, when the temperature falls from above the second temperature, the temperature is determined to fall to the first temperature when the temperature reaches (the first temperature-1) degree celsius when the temperature falls below the first temperature by one threshold. Other similarities, for the sake of brevity, are only expressed as similar statements as follows: "when the temperature is higher than the first temperature" and "the temperature falls to the ratio T1Low, etc., without everywhere emphasizing the concept of "threshold" above. As a possible specific example of the temperature threshold, 1 degree celsius may be taken; as a possible specific example of the rotational speed threshold, 50rpm/min may be taken.
Furthermore, the single chip microcomputer can detect a rotating speed feedback signal of the fan and/or detect the working current of the fan, and different rotating speeds of the fan and corresponding data of the working current are obtained in a test mode.
And carrying out a power-on self-test process when the vehicle is electrified, controlling the cooling fan to run from the first rotating speed to the third rotating speed no matter what the temperature is, judging whether the fan can run normally or not, and if the fan cannot run normally, recording fault information and reporting the fault information to other electronic control units. The method comprises the following steps of acquiring a data table of a rotating speed control signal, a fan working current and an actual rotating speed of the fan of the single chip microcomputer based on a test under a normal state of the fan, judging whether the fan works normally based on the corresponding relation of the three, and judging whether the fan operates normally by the single chip microcomputer according to the following mode: one method is to detect the feedback of the rotating speed of the fan to judge whether the rotating speed of the fan meets the expectation, and if the rotating speed does not meet the expectation, the fault is judged; if the fan does not have a rotating speed feedback signal, a test means can be carried out to obtain the relationship between the rotating speed and the current of the fan, the singlechip judges whether the loop of the cooling fan is broken, short-circuited or locked according to the given target rotating speed of the fan and the current of the fan, and fault information is fed back if the fan cannot normally operate.
Further, after the temperatures of all the LED central positions are detected, the temperature of the LED unit with the highest temperature is screened out through a control chip such as a single chip microcomputer, a corresponding fan rotating speed control strategy is implemented according to the temperature, and if the temperatures of a plurality of LED units exceed the first protection temperature TP1All LED units exceeding the first protection temperature are subjected to a corresponding power limited control.
The control mode is as follows:
and when the self-checking is finished and no fault exists, starting the control flow, and if the fan has a fault, reporting the fault.
And if the highest temperature of the LED unit is lower than the first temperature, stopping the fan.
If the highest temperature of the LED unit is higher than the second temperature T2And has not yet reached TP1When the fan is running, the fan is running at the highest speed.
If the temperature of one or some of the LED units is higher than the first protection temperature TP1And has not yet reached TP2When the fan is rotating at the highest speedThe LED temperature control device runs quickly, simultaneously limits the output power of all the LED units with overhigh temperature, the actual power of the LED is the product of the conventional specified output power (namely the output power required when temperature protection is not needed) and a power limiting coefficient, and the power limiting coefficient rho and the actual temperature TtIn this regard, the actual temperature may vary between the first protection temperature and the second protection temperature according to a certain rule, wherein one possible embodiment is a linear power limit: ρ ═ T (T)P2-Tt)/(TP2-TP1)。
If the temperature of one or some of the LED units is higher than the second protection temperature TP2When the LED units work, the heat dissipation fan rotates at the highest rotating speed, and the corresponding LED units stop working.
When the temperature is higher than the first temperature T1And has not yet reached T2When the temperature is reduced to the ratio T, the routine control flow is started, and if the temperature is reduced to the ratio T after the control1And if the voltage is low, the fan stops working. One specific example of a conventional control flow may be as follows: the single chip microcomputer patrols every 1 second, samples all the temperature sensors, calculates the change rate of the temperature every 30 seconds, and records the change rate as F, namely, the temperature change value delta T is divided by 30, it should be noted that if the temperature does not change within the time interval of 30S when the temperature change rate is calculated, the single chip microcomputer tracks the next temperature change and calculates the temperature change value delta T, and accumulates the time delta T during which the temperature changes, and accordingly, the temperature change rate is K delta T/delta T (K is a normalized adjustment coefficient), further, the temperature change rate can be normalized to a certain value between-1 and +1, for example, F is considered as 1 when the temperature rises to or exceeds 3 ℃ within 30S (K is taken as 10).
The temperature is represented by two aspects, namely the temperature and the speed of the temperature (rising or falling) change rate, which influence the control strategy to control the heat radiation fan. The temperature is normalized, so that the calculation and the implementation of a control strategy are facilitated. The implementation is as follows: in the temperature interval between the first temperature and the second temperature, the temperature is normalized by H-T (T)t-T1)/(T2-T1) The physical meaning of H is the normalization of temperatureThe latter quantitative description, e.g. when the temperature T istIs T2When H is 1, the temperature is high, and when T is the temperaturetIs T1When H is 0, the temperature is low.
The normalization process of the temperature and the temperature change rate is based on a complete linearization process within a corresponding range of the physical quantity, and it should be added that this is only a possible and simple embodiment, and the method proposed by the embodiment of the present invention is not limited to the actual method using normalization, in other words, the normalization process may be a piecewise linear process or even a nonlinear process.
The foregoing has been normalized to the rate of temperature change to F. Based on H and F, a control strategy is formulated as follows: target rotation speed of heat-dissipating fan is S0+ (a ＊ F + b ＊ H) ＊ a, where a and b are weighting factors, the sum of which is 1, and the weighting factors can be adjusted according to actual needs, and a ═ 0.2 and b ═ 0.8. a are the difference between rated rotation speed and minimum rotation speed.
To sum up, in the control method of the automobile lamp according to the embodiment of the present invention, each LED unit is correspondingly provided with a plurality of temperature sensors to obtain the current temperature of the central area according to a plurality of temperature signals, so as to determine the target rotation speed of the cooling fan according to the maximum value of the current temperature and the change rate of the temperature, and improve the accuracy of the detection of the temperature of the automobile lamp, thereby optimizing the control mode of the fan, not only effectively meeting the requirement of the temperature detection of the automobile lamp, but also saving energy, improving the timeliness of the control, being safer and more reliable, and improving the use experience.
Next, a control device of an automotive lamp according to an embodiment of the present invention will be described with reference to the drawings.
Fig. 3 is a block diagram schematically illustrating a control device for vehicle lamps according to an embodiment of the present invention.
As shown in fig. 3, the control device 10 for the vehicle lamp includes: an acquisition module 100, an acquisition module 200 and a first control module 300. Wherein, each LED unit of car light is provided with a plurality of temperature sensor correspondingly.
Specifically, the collecting module 100 is used for collecting a plurality of temperature signals of each LED unit through a plurality of temperature sensors.
The obtaining module 200 is configured to obtain a current temperature of the central area of each LED unit according to the plurality of temperature signals.
The first control module 300 is configured to determine a highest value of a current temperature of the central area, and determine a target rotation speed of the cooling fan according to the highest value of the current temperature and a current temperature change rate when the highest value is greater than or equal to a first temperature value and is less than or equal to a second temperature value, where the second temperature value is greater than the first temperature value.
Further, in one embodiment of the present invention, the apparatus 10 of the embodiment of the present invention further comprises: and a second control module. The second control module is used for stopping the operation of the cooling fan when the highest value of the current temperature is smaller than the first temperature value.
Further, in one embodiment of the present invention, the apparatus 10 of the embodiment of the present invention further comprises: the device comprises a third control module, a fourth control module and a fifth control module.
The third control module is used for controlling the cooling fan to operate at the highest rotating speed when the highest value of the current temperature is larger than the second temperature value and is smaller than or equal to the first temperature protection value, wherein the first temperature protection value is larger than the second temperature value.
The fourth control module is used for controlling the cooling fan to operate at the highest rotating speed and adjusting the working power of the LED unit with the temperature greater than the first temperature protection value by a power limiting strategy when the highest value of the current temperature is greater than the first temperature protection value and is less than or equal to the second temperature protection value, wherein the second temperature protection value is greater than the first temperature protection value.
And the fifth control module is used for controlling the cooling fan to operate at the highest rotating speed and stopping the LED units with the temperature greater than the second temperature protection value from working when the highest value of the current temperature is greater than the second temperature protection value.
Further, in one embodiment of the present invention, the apparatus 10 of the embodiment of the present invention further comprises: and a detection module. The detection module is used for detecting the current rotating speed and/or current of the cooling fan; and the sending module is used for sending alarm information when the fault of the cooling fan is confirmed according to the current rotating speed and/or the current.
It should be noted that the foregoing explanation of the embodiment of the control method for the vehicle lamp is also applicable to the control device for the vehicle lamp of the embodiment, and details are not repeated here.
To sum up, in the control device of the automobile lamp according to the embodiment of the present invention, each LED unit is correspondingly provided with a plurality of temperature sensors to obtain the current temperature of the central area according to a plurality of temperature signals, so as to determine the target rotation speed of the cooling fan according to the maximum value of the current temperature and the temperature change rate, improve the accuracy of the temperature detection of the automobile lamp, optimize the control mode of the fan, effectively meet the temperature detection requirement of the automobile lamp, save energy, improve the timeliness of control, and be safer and more reliable, thereby improving the experience of use and experience
In addition, the embodiment of the invention also provides an automobile, which comprises an automobile lamp, wherein the automobile lamp comprises a plurality of LED units, and each LED unit is correspondingly provided with a plurality of temperature sensors; and the control device of the automobile lamp. This car can obtain the regional current temperature in center according to a plurality of temperature signals to confirm radiator fan's target rotational speed according to the maximum value of current temperature and temperature rate of change, improve the accuracy that car light temperature detected, thereby optimize the control mode of fan, not only effectively satisfy the temperature detection demand of car light, the energy saving improves the ageing of control moreover, and is safe and reliable more, promotes to use and experiences.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A control method of an automobile lamp is characterized in that each LED unit of the automobile lamp is correspondingly provided with a plurality of temperature sensors, wherein the method comprises the following steps:
acquiring a plurality of temperature signals of each LED unit through the plurality of temperature sensors;
acquiring the current temperature of the central area of each LED unit according to the plurality of temperature signals; and
determining the highest value of the current temperature of the central area, and determining the target rotating speed of the cooling fan according to the highest value of the current temperature and the current temperature change rate when the highest value is greater than or equal to a first temperature value and is less than or equal to a second temperature value, wherein the second temperature value is greater than the first temperature value.
2. The method of claim 1, further comprising:
and if the highest value of the current temperature is smaller than the first temperature value, stopping the operation of the cooling fan.
3. The method of claim 1, further comprising:
and if the highest value of the current temperature is greater than the second temperature value and less than or equal to the first temperature protection value, controlling the cooling fan to operate at the highest rotating speed, wherein the first temperature protection value is greater than the second temperature value.
4. The method of claim 3, further comprising:
if the highest value of the current temperature is greater than the first temperature protection value and is less than or equal to a second temperature protection value, controlling the cooling fan to operate at the highest rotating speed, and adjusting the working power of the LED unit with the temperature greater than the first temperature protection value by a power limitation strategy, wherein the second temperature protection value is greater than the first temperature protection value;
and if the highest value of the current temperature is greater than the second temperature protection value, controlling the cooling fan to operate at the highest rotating speed, and simultaneously stopping the LED units with the temperature greater than the second temperature protection value from working.
5. The method according to any one of claims 1-4, further comprising:
detecting the current rotating speed and/or current of the cooling fan;
and sending alarm information when the fault of the cooling fan is confirmed according to the current rotating speed and/or the current.
6. The utility model provides a controlling means of car light which characterized in that, every LED unit correspondence of car light is provided with a plurality of temperature sensor, wherein, the device includes:
the acquisition module is used for acquiring a plurality of temperature signals of each LED unit through the plurality of temperature sensors;
the acquisition module is used for acquiring the current temperature of the central area of each LED unit according to the plurality of temperature signals; and
the first control module is used for determining the highest value of the current temperature of the central area, and determining the target rotating speed of the cooling fan according to the highest value of the current temperature and the current temperature change rate when the highest value is larger than or equal to a first temperature value and smaller than or equal to a second temperature value, wherein the second temperature value is larger than the first temperature value.
7. The apparatus of claim 6, further comprising:
and the second control module is used for stopping the operation of the cooling fan when the highest value of the current temperature is smaller than the first temperature value.
8. The apparatus of claim 6, further comprising:
the third control module is used for controlling the cooling fan to operate at the highest rotating speed when the highest value of the current temperature is greater than the second temperature value and is less than or equal to the first temperature protection value, wherein the first temperature protection value is greater than the second temperature value;
the fourth control module is used for controlling the cooling fan to operate at the highest rotating speed and adjusting the working power of the LED unit with the temperature greater than the first temperature protection value by a power limiting strategy when the highest value of the current temperature is greater than the first temperature protection value and is less than or equal to a second temperature protection value, wherein the second temperature protection value is greater than the first temperature protection value;
and the fifth control module is used for controlling the heat radiation fan to operate at the highest rotating speed and stopping the LED units with the temperature higher than the second temperature protection value from working when the highest value of the current temperature is higher than the second temperature protection value.
9. The apparatus of claim 6, further comprising:
the detection module is used for detecting the current rotating speed and/or current of the cooling fan;
and the sending module is used for sending alarm information when the fault of the cooling fan is confirmed according to the current rotating speed and/or the current.
10. An automobile, comprising:
the vehicle lamp comprises a plurality of LED units, wherein each LED unit is correspondingly provided with a plurality of temperature sensors; and
the control device of the vehicle lamp according to any one of claims 6 to 8.
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